Casing structure



April 28, 1925, 1,535,616 7 P. M GAHAN CASING STRUCTURE Filed Jan. 30,1922 WITNESSES: 1 4 INVENTOR r TTORNE Patented Apr. 28, 1925.

UNITED STATES PATENT oFFicE.

PAUL MACG'AHAN, OF PITTSBURGH, PENNSYLVANIA, ASSIG-NOB TO WESTINGHIJUSEELECTRIC 8: MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

CASING s'rnno'rman.

Application f led January 30, 1923. Serial No. 615,865.

T 0 all whom it may concern:

Be it known that I, PAUL MAoGAnAn, a citizen of the United States, and aresident of Pittsburgh, in the. county of Allegheny and State ofPennsylvania, have invented a. new and useful Improvement in CasingStructures, of which the following is a specification. l My inventionrelatesto casing structures and particularly to casings for electricalmeasuring instruments. 7

One object of my invention is toprovide a structure of the aboveindicatedcharacter that shall be compact, neat in appearance, rugged 1and durable in construction, economical to manufacture and effective inits operation.

Anothaar object of my invention'is to provide an instrument casinothatshall'b'e effectively permanently sealed around a window portionthereof. 7

A further object of my invention is to provide means for so mounting aglass window member in an instrument casing as .to prevent injury to thewindow member.

In practicing my invention, I provide a casing structure having ayieldable window seat and a sealing member so related to the casing andso held in position as to effect a permanent seal around the window, toprevent injurytb the window member, to economize in the manufacture ofthe casing and to renderthe same compact" and neat in appearance.

Figure Lot-the accompanying drawings is a side sectional view of aninstrument v casingconstructed in accordance with my invention, and fl f1 Fig. 2 is a view, similar to Fig. 1, of a modified form ofmyinvent-ion. I 1

In the form shown inFig. 1 my invention comprises, ingeneral, a casing1, a glass window member 2, a sealing member and members 4 for holdingthe members 2 and 3 inpositioni y The casing 1 is preferablyconstructedof relatively thin sheet material, of tubular or cylindrical form,having an integral front end portion bent outwardly to provide atransverse perimetral shoulder 5 and bent inwardly, from the outerperimeter of the shoulder 55, to provide an inwardly projecting flexibleflange 6.

The glass window member 2 is preferably of the usual flat plate ordiscoidal form and is adapted to be inserted from the" rear of thecasing .1 for lateral positioning against the flange 6. 4 V a Thesealing member 3,prefera'bly constructed of insulating material, isconstructed of tubular or cylindricalf'orm'to closely fit, and to have arelatively large; bearing surface adjacent to, the inner surface of thecasing 1. This construction permits the member 3 to telescope thecasing, andto,

therefore, be accurately centeredj or posi tioned with respect thereto.

I The members 4, conforming on the lateral sides thereof to the adjacentsurfaces of the casing 1, are provided with outwardly bent portions 7,at the outer ends thereof, for

positioning against the shoulder. 55 and,fat

the inner ends thereof, with inwardly projecting portions 8 forpositioning behind the sealing member. 3.

In assembing the 3 and 4 are pressed inwardly, in assembled relation,fromthe rear of the casing to the position shown in the drawing. Duringthis'op'eration, by reason of i m g ment ofthe parts, the flange 6fisslightly device, the members 2,-

flexedoutwardly to permit the portions 7 v to be properly fitted againstthe slioulder ti. V

The glass window member 2 is jthus firmly held between the flexibleflange. 6 and the insulating sealing member" 3 toi'elfectivelyseal'thecasing and to prevent injury to the glass by temperature changesand other Causes. Y. ,1-

In Fig.2, in which corresponding parts are designated by correspondingreference numerals, the construction is substantially the same asin theabove described form, with the exceptionthat members 9 are sub st itutedfor the members 4 to hold the members Q-and 3 imposition, The members 9,preferably of metaland rectangular plate formation, are secured inflat-surfaceengagement with the inner surface of the we ing 1 in anysuitable manner, as by welding or soldering.

In assembling the device shown in Fig. 2, the members 2 and 3 are alsopressed for wardly in the casing until sufficient pressure has beenexerted against tlie'flange 6 and the membersv 9 afterwards mounted inposition.

In both forms of my invention, the dedow openingand a flange or seatportion a-rouii'd'the opening, a,wmdow-memberj seat- .ed behind said"flange and held in position thereby, perimetral member adapted forinsertion in the casing from the rear'ot' said window'to hold saidwindow member in po- ,sitionfand means for positively interlocking said'perimetral member in positioninthe casing. p

In combination, a tubular casing hav- 4 ing a perimetral front-endflange, a windowmember for insertion through the rear oi the casing toposition behind said flange and heldin position thereby, a tubularmember closely fitting the inner surface ot the casing for insertionthrough the rear thereof to position against said window member andmeans for positively interlocking said tubular member inpositionin thecasing.

3; In combination, a tubular casing having a perimetral front-endflange, a window member for insertion through the rear of the casing to'position behind said flange and'held in position thereby, a tubular member closely fitting the'inner surface of the casing't'or insertionthrough the rear thereof to position against saidwindow member and meansprojecting inwardly from the inner surface of the casing behind saidtubular member for holding the latter in position.

1a." In combination, a casing having a window opening'and-a flangearound the opening, a: window plate seated laterally behind said flangeandlield in position thereby, and a'inember of non-metallic sheetmaterial en'- gaging and extending normal to said plate, and means forholding said non-metallic member in positively ii'iterlo'cked relationto the casingtohold the plate in position.

Incombination, a relatively thin sheetmetal cylindrical casing having aflexible inwardly projecting perimetral front-end flange, 'acircularwindow platedisposed in thecasing adjacent to saidflange, anon-metallic'cylinder closely fitting the casing adjacent to said plateand means for positively interlocking thecylinder in position in thecasing.

' In combination, a relatively thin sheetadjacent 'to' said plate andextending inwardly a certain distance theretron'i and means projectinginwardly from the casing behind said nonmetallic cylinder for holdingthe latter in position, the operative positioning of said means beingpermitted by pressing the non-metallic tube and the plate to flex saidflange.

'1'. In combination, a casing having a transverse shoulder, awindow-member, an inner sealing or seat member "for the window memberand a member between a portion of the casing and the window memberhaving a portion engaging said shoulder and a portion behind said seatmember.

8. In combination, a casing having a transverse shoulder, a windowmember, an inner sealing or seat member for the window memberand aplurality of angularly spaced members each extending longitudinally inthe casing between a portion of the latter and the window member havinga transverse portion engaging said shoulder and a transverse portionbehind said seat member. a

9. In combination, a tubular casing having an outwardly extendingtransverse shoulder andan inwardly extending transverse flange, a windowmember seated laterally'against said flange, a sealing or seat memberbehind said ,window member and a member between a portion of the casingand the window member having a portion engaging said. shoulder and aportion for holding. said seat member in position. i 10. In combination,a sheet-material tubular casing having a. front-end portion bentoutwardly to provide a t'ansverse perimetral shoulder and bentinwardlyfrom the outer perimeter of said shoulder to provide a flexibleperimetral flange, a window member seated laterally against said flangein the casing, a perimetral sealing member be hind said window memberand a member disposed between the sealing member and the inner surfaceof the casing having an outwardly projecting outer end portion forposition over said shoulder and an inwardly projecting inner end portionfor position behind said sealing member.

In testimony whereof, I have hereunto subscribed my name this 11th dayof J anuary 1923.

PAUL MACGAHAN.

